Question 1

Which hybrid orbitals are impossible in electrically neutral molecules containing only the elements shown?

Accepted Answer

A)   sp3/Al and H
B)   sp2/B and F
C)   sp/C and H
D)   sp2/N and O
E)   sp3/O and FF) C) and E)
G) All of the above

Question 2

The three molecular shapes an sp3 hybridized molecule can have are ________.

Accepted Answer

A)   triangular, bent, T-shaped
B)   irregular tetrahedron, T-shaped, linear
C)   octahedron, square pyramid, square planar
D)   tetrahedron, trigonal pyramid, bent
E)   tetrahedron, T-shaped, bentF) A) and B)
G) C) and D)

Question 3

Which of the following statements about extrinsic semiconductors is INCORRECT?

Accepted Answer

A)   They are generally made from pure Si or Ge with small amounts of impurities.
B)   n-type are those in which the impurity is an element of Group 15.
C)   p-type are those in which the impurity is an element of Group 13.
D)   The crystal need not be very pure before the impurity is added to produce the semiconductor.
E)   Boron is a common impurity in n-type extrinsic semiconductors.F) C) and D)
G) All of the above

Question 4

Choose the INCORRECT statement about H3O+.

Accepted Answer

A)   There is one π bond.
B)   There are 3 σ bonds.
C)   There is one lone pair on O.
D)   The hybridization on O is sp3.
E)   The OH bonds are O(sp3)  - H(1s) .F) A) and E)
G) A) and B)

Question 5

Choose the INCORRECT statement about AsF6-.

Accepted Answer

A)   The hybridization is sp3d2.
B)   The molecule is octahedral.
C)   There are no π bonds.
D)   There is one lone pair of electrons.
E)   There are six σ bonds.F) C) and D)
G) B) and E)

Question 6

According to principles of VSEPR theory applied on AsCl52-, which of the following is INCORRECT?

Accepted Answer

A)   VSEPR formula = AX5E
B)   molecular geometry = square planar
C)   electron pair geometry = octahedral
D)   hybridization = sp3d2
E)   one lone pair and 5 bonding pairsF) A) and D)
G) None of the above

Question 7

According to MO theory, all of the following have a bond order of 2 EXCEPT:

Accepted Answer

A)   NO
B)   CN+
C)   C2
D)   O2E) B) and C)
F) A) and D)

Question 8

Which statement is correct for the structure shown?

Accepted Answer

A)   Carbon no. 1 is described by sp3 hybridization.
B)   The molecule contains 19 σ bonds.
C)   Carbon no. 2 is described by sp2 hybridization.
D)   The molecule contains a total of five π bonds.
E)   Carbon no. 7 is described by sp hybridization.F) B) and E)
G) All of the above

Question 9

The octahedral hybrid configuration is composed of which orbital combination?

Accepted Answer

A)   sp3d2
B)   sp2d3
C)   spd2
D)   sp3d
E)   sp3F) A) and C)
G) All of the above

Question 10

A junction in a photovoltaic (solar)  cell is which of the following?

Accepted Answer

A)   a thin layer of n-type semiconductor in contact with a p-type semiconductor
B)   three pieces of semiconductor that form a p-n-p connection
C)   wires that carry electricity that are attached to the cell
D)   pure germanium that is attached to a p-type semiconductor
E)   a thin layer of p-type semiconductor in contact with an n-type semiconductorF) A) and C)
G) B) and E)

Question 11

What would be the hybridization of the N in the benzene-like molecule (C5H5N) ?

Accepted Answer

A)   sp
B)   sp3
C)   sp3d2
D)   sp3d
E)   sp2F) C) and E)
G) None of the above

Question 12

Which of the following statements is INCORRECT?

Accepted Answer

A)   Delocalized pi orbitals are formed when electrons are shared by unhybridized p orbitals in more than two atoms.
B)   The band theory is a form of molecular orbital theory.
C)   In band theory, there are two bands.
D)   The valence band is at higher energy than the conduction band.
E)   An energy band partially filled with electrons is a conduction band.F) A) and D)
G) A) and C)

Question 13

What is the hybridization of the Xe atom in XeF2?

Accepted Answer

A)   sp3d
B)   sp
C)   sp3
D)   sp2E) None of the above
F) C) and D)

Question 14

Molecular orbitals are formed by adding and subtracting atomic orbitals.

Accepted Answer

A) True 
 B)False

Question 15

According to the band theory of bonding, the smallest energy difference between a conduction band and a valence band typically occurs in substances such as:

Accepted Answer

A)   crystalline rock salt
B)   crystalline rubidium
C)   crystalline silicon
D)   crystalline iodine
E)   crystalline arsenicF) A) and E)
G) D) and E)

Question 16

The valence-bond method provides energy information about molecules.

Accepted Answer

A) True 
 B)False

Question 17

Which of the pairs of molecules below have the same hybridization on the central atom? (The central atom is underlined in each molecule.)

Accepted Answer

A)   CO2, CH4
B)   H2CO, BeH2
C)   BCl3, HNO
D)   H2O, HF
E)   NH3, HNOF) C) and D)
G) A) and E)

Question 18

What are the ideal bond angles for H2O?

Accepted Answer

A)   120°
B)   109.5°
C)   90°
D)   180°
E)   75°F) B) and C)
G) B) and D)

Question 19

For the molecule

Accepted Answer

A)   the hybridization for C is sp3
B)   the hybridization for N is sp2
C)   the hybridization for O is sp3
D)   N is not hybridized
E)   the hybridization for C is sp2F) None of the above
G) B) and C)

Question 20

Band theory describes the properties of metals and insulators but not semiconductors.

Accepted Answer

A) True 
 B)False

Exam 11: Chemical Bonding II: Additional Aspects

Band theory describes the properties of metals and insulators but not semiconductors.

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What are the ideal bond angles for H2O?

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Molecular orbitals are formed by adding and subtracting atomic orbitals.

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What is the hybridization of the Xe atom in XeF2?

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The three molecular shapes an sp3 hybridized molecule can have are ________.

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Choose the INCORRECT statement about AsF6-.

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The octahedral hybrid configuration is composed of which orbital combination?

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Which of the following statements is INCORRECT?

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According to principles of VSEPR theory applied on AsCl52-, which of the following is INCORRECT?

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For the molecule

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According to the band theory of bonding, the smallest energy difference between a conduction band and a valence band typically occurs in substances such as:

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The valence-bond method provides energy information about molecules.

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Which hybrid orbitals are impossible in electrically neutral molecules containing only the elements shown?

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Choose the INCORRECT statement about H3O+.

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Which of the pairs of molecules below have the same hybridization on the central atom? (The central atom is underlined in each molecule.)

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A junction in a photovoltaic (solar) cell is which of the following?

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According to MO theory, all of the following have a bond order of 2 EXCEPT:

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Which of the following statements about extrinsic semiconductors is INCORRECT?

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What would be the hybridization of the N in the benzene-like molecule (C5H5N) ?

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Which statement is correct for the structure shown?

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What are the ideal bond angles for H₂O?

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Choose the INCORRECT statement about H₃O⁺.

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What would be the hybridization of the N in the benzene-like molecule (C₅H₅N) ?

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